Adjustable piston



" ...6.,-1936. F.'J. {sMAlfLvwool-J Ll I I 2,055,302 I l ADJUSTABLE PI'sToN original Filed Dec. 15.193,2

Patented Oct. 6, 1936 UNITED STATES ADJUSTABLE PISTON Frederick James Smallwood and Walter Eli Willson, Toronto, Ontario, Canada Application December 14, 1932, Serial No. 647,148 Renewed February 21, 1936 2 Claims.

The invention relates to an adjustable piston, as described in the present specification and illustrated in the accompanying drawing which forms a part of the same.

The invention consists essentially in reducing the frame or skirt continuation of the head and lling the vacancy with a sleeve of any desired diameter as pointed out in the claims for novelty following a description containing an explanation in detail of an acceptable form of the invention.

The objects of the invention are to eliminate the necessity of reboring cylinders to accommodate a piston and in place build up the piston diameters to suit the cylinder and to do this in a simple, eicient and economical way that will prove effective in almost all such troubles; to cut down the cost of maintenance in the engine structures and insure more eflicient running conditions and a reduction in the consumption in fuel; and generally to provide a piston in replaceable parts that will lend itself to ready adjustment in respect to diametrical dimensions.

In the drawing, Figure 1 is a side elevational View of the piston showing the sleeve secured thereto.

Figure 2 is a side sectional view of the piston with the sleeve and shims.

Figure 3 is a plan View of the underside of the piston.

Figure 4 is a side elevational view of the piston without the sleeve` Figure 5 is an enlarged perspective view of one of the sleeve sections.

Figure 6 is an enlarged perspective view of one of the shims.

Figure 7 is a sectional View of the piston and sleeve as connected to a crank shaft.

Like numerals of reference indicate corresponding parts in the various gures.

Referring to the drawing, the piston head portion is indicated by the numeral I and the grooved wall II containing the rings I2 is continued in the skirt or frame I3 reduced in its outside diameter in respect to the outside diameter of the head portion and having inwardly projecting bosses I4 in the interior forming supports for the wrist pin bearing structure I for the rod I6, said skirt or frame forming with the head portion, the shoulder I'I. Y

The pierced lugs I8 in diametrical pairs project inwardly at the lower end of the skirt or frame I3 and are flush with the lower edge face thereof.

The split sleeve in two or more parts I9 envelop the skirt or frame I3 and the intermediate placed pierced lugs in diam'etrcal pairs project inwardly and register with the lugs I8 and are secured thereto by the bolts 2| and nuts 22. The

upper edge of the split sleeve sections I9 is bevelled so as to nt snugly under the shoulder I I which has an inwardly extending bevel to accommodate the sleeve I9, the sides 26 and 21 of the sleeve I9 are also bevelled and the joint is made on an angle as will be seen at 28 so as to make the skirt fit perfectly when bolted into position.

The shims 23 which are shaped similarly to the split sleeves I9 are inserted in between the split sleeve I9 and the skirt or frame I3 and are adapted to take the place of any wear and tear on the split sleeve thereby eliminating the necessity of having to renew the sleeve and increasing the life of the engine.

In the use of the piston, the piston itself is mounted in the usual manner in the cylinder of the engine and after the engine has been in use for a considerable length of time, suicient to wear away the sleeve of the piston, the shims are inserted in between the split sleeve and skirt so as to replace any slack that might have been caused through the wear of said sleeve or skirt and in that way practically renew the piston from an old to a new one and with the consequent saving in replacing the piston with a completely new one.

What we claim is:

1. An adjustable piston having a head having a grooved wall and an annular shoulder around its lower end, a skirt forming an integral part of the piston head and projecting downwardly behind the shoulder and having inwardly extending pierced lugs adjacent its lower end, a split sleeve enveloping said skirt and projecting downwardly and interlocking with the shoulder of said piston head at the upper end, and having inwardly extending pierced lugs adjacent the lower end cooperating with the pierced lugs of said skirt and secured thereto.

2. An adjustable piston having a head having a grooved wall and an annular shoulder around its lower end, a skirt forming an integral part of the piston head and projecting downwardly behind the shoulder and having inwardly extending pierced lugs adjacent its lower end, a sleeve formed of two parts enveloping the skirt and being in vertical parallelism therewith and interlocking with the shoulder of said piston head at the upper end and having inwardly extending pierced lugs co-operating with the pierced lugs of the skirt and secured thereto, and a shim formed of two parts and inserted between the skirt and the sleeve and in vertical parallelism therewith and supported at the lower end by the inwardly projecting pierced lugs of said sleeve.

FREDERICK JAMES SMALLWOOD. WALTER ELI WILLSON. 

